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precast concrete floors

When talking about precast concrete floors is something that is often heard. and general home builders or home builders in Korat รับสร้างบ้านโคราช Often already familiar with the use of precast concrete floors. Regularly, the details of the precast concrete floor are as follows:

6. Precast concrete floor

Construction of floors from prefabricated concrete slabs It typically consists of several longitudinal prefabricated slab units. The sheets are brought together to form a rash. Each precast concrete slab is produced from the factory. It is molded from liquid concrete using cement mortar used for structural work and then pre-stressed by pre-tensioning method as mentioned in the previous section. To make the finished slab to be thin, light weight, and can also be placed across the length longer as well.

The width and length of the slabs are limited by the means of transportation. However, the advantage of casting precast concrete slabs at the factory is that Able to better control quality in various aspects such as strength and durability of concrete mix. skin retouching and a more complete formwork While the shape of the factory slabs are standardized in similar sizes and shapes, which more comfortable for house builder also in Ratchaburi  รับสร้างบ้านราชบุรี  but it is possible that the slabs do not correspond to buildings with unusual space shapes, such as circular arc areas.

  • 2″ to 31/2″ (51 to 90) topcoat concrete with rebar mesh. Fastened together on the back of the precast concrete slab as well.
  • Mortise
  • In addition to the concrete topcoat, it serves to attach the prefabricated slab to the beam. It also acts in conjunction with the slab to form a composite cross-section to make it stronger. It also helps prevent the spread of fire in the event of a fire. as well as a place for conduit and water supply pipes to walk inside as well
  • In the case of surface finishing work using concrete Decoration work and concrete topcoat can be combined at once.
  • In the event that the floor must support horizontal loads on the sides Under the prefabricated floor slabs may transfer force into beams or load-bearing walls. Decorate the skin and make a blemish
  • It is necessary to put the bracket at the end of the ceiling slab at all. Or may bring a gypsum ceiling to hang at the bottom.
  • Small openings can be done at the construction site.
  • The opening should have a long side parallel to the horizontal line of the finished sheet.
  • In case of large openings, consult a structural engineer.
  • Prefabricated beams or walls or molded in place to support prefabricated slabs

7. Types of precast concrete slabs

precast concrete slabs

  • Over 12′ to 24′ (3.6 to 7 m)
  • The thickness is approximately equal to the length of the cross section 40.

Hollow precast concrete slabs

  • Span 12′ to 40′ (3.6 to 12 m)
  • The thickness is approximately equal to the length of the cross section 40.

Single T-shaped precast concrete slab

  • Span 30′ to 120′ (9 to 36 m)
  • The thickness is approximately equal to the length of the cross section 30.

Twin T-shaped precast concrete slabs

  • Span 30′ to 100′ (9 to 30 m)
  • The thickness is approximately equal to the length of the cross section 28.
  • Double T-slabs do not tilt compared to single T-slabs.

8. Joints of prefabricated concrete floor buildings

precast concrete slabs

  • Precast concrete walls.
  • The steel dowels from the columns are inserted into the hollows of the floor slabs. Hollow at the end support
  • Fill concrete or grout to the end of the hollow slab.
  • together with a thick and dense rubber sheet.
  • The shoulder length is at least 1⁄180 of the net length. but not less than 2″ (51)
  • Pour reinforced concrete which will bond to the slab and act together to support the load at least 2″ (51) thick.
  • Steel fixing the end of the plate at the support point at the continuous area.
  • Insert the steel sleeve into the concrete topcoat.

precast concrete slabs

  • Weld the steel plates of the columns with the cast iron plates attached to the floor plates.
  • Thick rubber or plastic sheet.
  • Bolts hold the side plates together.
  • Thick rubber or plastic sheet.
  • in the area of ​​support Fill concrete to cover the holes of hollow slabs.
  • Steel fixing the end of the plate at the support point.
  • Walls of masonry or reinforced concrete.

T-shaped precast concrete slab

  • Weld the plastered steel with the steel sheet of the shaped floor plate. T and the steel plate of the pillar
  • Floor with rubber pads. (synthetic rubber)
  • The shoulder width is at least 1⁄180 of the net length. but not less than 3″ (76)
  • Concrete and steel reinforcing topcoat.
  • Weld the steel sheet with the angle steel of the beam and the steel sheet of the floor slab.
  • Inverted T-beam

precast concrete

  • Weld angle steel with sheet steel of prefabricated columns and beams.
  • Rubber pad (synthetic rubber)
  • Shoulder beams at the head of the pillar.
  • Cast iron is attached to the prefabricated beams.
  • Steel shoulder to support beam embedded in concrete column.

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